that the fight against the enmili-in afghanistan has claimed a victory. U.S. Officials confirming a powerful mastermind of attacks on u.S. Forces has been killed by a drone strike. Abc's chief global affair, correspondent martha raddatz with those details. Reporter: We here at home go on with our lives, off to work, off to school, some 7,000 miles away in pakistan, a secret war is being waged from the sky. And last night, the u.S. Scored a major victory in that war. A drone strike, killing a man named maulvi nazir, who had been sending fighters to attack our troops in afghanistan. This is the first drone strike of 2013. More than 350 have been launched since 2004. A large number of their top leadership, as well as a lot of the mid-level and foot soldiers have been taken out by these strikes. Reporter: But while the drone war grows, the u.S. Will soon be drawing down the 66,000 u.S. Forces in afghanistan today. Military planners say 6,000 to 20,000 remain after 2014, to ensure the country does not descend again into a safe haven for terror. Officials have I spoken to believe that president obama will opt for fewer troops and a faster withdrawal, which means in the future, we will likely be even more dependent on these drone strikes, diane. Thank you so much, martha.

This transcript has been automatically generated and may not be 100% accurate.

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